FKIE_CVE-2026-63932

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-19 16:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: iio: chemical: mhz19b: reject oversized serial replies mhz19b_receive_buf() appends each serdev chunk into the fixed MHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without checking that the chunk fits in the remaining space. A large callback can therefore overflow st->buf before the command path validates the reply. Reset the reply state before each command and reject oversized serial replies before copying them into the fixed buffer. When an oversized reply is detected, wake the waiter and report -EMSGSIZE instead of overwriting st->buf.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/chemical/mhz19b.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a5a05410cb34bfa486d63684cdc1f87a3b13f20a",
              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            },
            {
              "lessThan": "ea69e7a6efa88ef32090a91064c362738cc19ddd",
              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            },
            {
              "lessThan": "673478bc29cf72010faaf293c1c8c667393335a0",
              "status": "affected",
              "version": "4572a70b3681e38055c78d12fb68cd147bdbee7d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iio/chemical/mhz19b.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: chemical: mhz19b: reject oversized serial replies\n\nmhz19b_receive_buf() appends each serdev chunk into the fixed\nMHZ19B_CMD_SIZE receive buffer and advances buf_idx by len without\nchecking that the chunk fits in the remaining space. A large callback\ncan therefore overflow st-\u003ebuf before the command path validates the\nreply.\n\nReset the reply state before each command and reject oversized serial\nreplies before copying them into the fixed buffer. When an oversized\nreply is detected, wake the waiter and report -EMSGSIZE instead of\noverwriting st-\u003ebuf."
    }
  ],
  "id": "CVE-2026-63932",
  "lastModified": "2026-07-19T16:17:11.633",
  "metrics": {},
  "published": "2026-07-19T16:17:11.633",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/673478bc29cf72010faaf293c1c8c667393335a0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a5a05410cb34bfa486d63684cdc1f87a3b13f20a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ea69e7a6efa88ef32090a91064c362738cc19ddd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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